关键词: 重金属, 类金属, 分布, 水环境质量, 评价, 渭河

Abstract: Four sections were selected in the Weinan section of the lower reaches of the Weihe River, including Shuyuan Reservoir, Shicun Reservoir, Zhuhe Reservoir, and the intersection of the three rivers,samples would be taken once a month from January to September 2019 to determine the content of 7 heavy metals （including metalloids） in water, including Cu, Zn, Pb, Cd, Cr⁶⁺, Hg and As, and their distribution characteristics and pollution status were analyzed. At the same time, based on the water environment quality monitoring data of the Shuyuan Reservoir monitoring section, a fuzzy matter-element evaluation model for water environment quality based on entropy weight was introduced to comprehensively evaluate the water environment quality of the study area. The results showed that the contents of Cu, Pb, Cd, Cr⁶⁺, Hg and As met the ClassⅠstandard for surface water environmental quality, and the content of Zn met the Class Ⅱ standard for surface water environmental quality. Pb was the main potential ecological risk factor. The water quality of the lower reaches of the Weihe River was generally good, and the main pollution indicators were dissolved oxygen, chemical oxygen demand, permanganate index and total nitrogen.

Key words: heavy metals, metalloid, distribution, water environment quality, evaluate, Weihe River